STEAM και η Γη γυρίζει…(β’ μέρος) https://drive.google.com/file/d/1-T-L-phelLXshg7awTIErViIG9PSrpNE/view?usp=sharing
https://drive.google.com/file/d/1-T-L-phelLXshg7awTIErViIG9PSrpNE/view?usp=sharing